feat: Replace Twig with native PHP templates

- Remove twig/twig dependency from composer.json
- Convert all 25 Twig templates to native PHP templates
- New render() method in Plugin.php using PHP include with output buffering
- New render_partial() helper method for including partials
- Templates support theme overrides via fedistream/ directory
- Reduced plugin size by eliminating Twig and its dependencies

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -31,7 +31,7 @@ This project is proudly **"vibe-coded"** using Claude.AI - the entire codebase w
 - **Language:** PHP 8.3.x
 - **Framework:** Latest WordPress Plugin API
 - **E-commerce (optional):** WooCommerce 10.0+
-- **Template Engine:** Twig 3.0 (via Composer)
+- **Template Engine:** Native PHP templates (with theme override support)
 - **Communication Protocol:** ActivityPub
 - **Wordpress Base Theme** twentytwentyfive
 - **Frontend:** Vanilla JavaScript
@@ -658,3 +658,42 @@ if (get_option('wp_fedistream_enable_prometheus', 0) && $this->is_prometheus_act
 - Metrics use simple COUNT queries for performance
 - ActivityPub followers limited to top 10 to avoid cardinality explosion
 - Default disabled (opt-in via Settings > Integrations)
+
+### 2026-02-02 - Native PHP Templates v0.6.0
+
+**Summary:** Removed Twig dependency and converted all templates to native PHP for improved performance and reduced dependencies.
+
+**Changes:**
+
+- Removed `twig/twig` from composer.json dependencies
+- Converted all 25 Twig templates to native PHP templates
+- Updated `Plugin.php` with new `render()` method using PHP include with output buffering
+- Added `render_partial()` helper method for including partials from within templates
+- Added `get_template_path()` method supporting theme overrides via `fedistream/` directory
+- Reduced plugin package size by removing Twig and its dependencies
+
+**Files Modified:**
+
+- `includes/Plugin.php` - Removed Twig initialization, new native PHP render methods
+- `includes/Frontend/template-wrapper.php` - Updated docblock
+- `composer.json` - Removed `twig/twig` dependency
+
+**Templates Created (25 PHP files replacing Twig):**
+
+- `templates/partials/` - card-artist.php, card-album.php, card-track.php, card-playlist.php
+- `templates/single/` - artist.php, album.php, track.php, playlist.php
+- `templates/archive/` - artist.php, album.php, track.php, playlist.php, taxonomy.php
+- `templates/shortcodes/` - artist.php, album.php, track.php, playlist.php, player.php, releases-grid.php, tracks-list.php, artists-grid.php
+- `templates/widgets/` - recent-releases.php, popular-tracks.php, featured-artist.php, now-playing.php
+
+**Templates Deleted (25 Twig files):**
+
+- All `.twig` files in templates directory
+
+**Benefits:**
+
+- No external template engine dependency
+- Improved performance (no Twig compilation)
+- Native WordPress template overriding support
+- Smaller plugin package size
+- Simpler debugging with standard PHP